Questions tagged [boost]

A non-isolated DC/DC converter topology.

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36 views

How to fully discharge supercapacitor?

My biggest problem is when I discharge a supercapacitor, let's say 100F 2.7V, I use a boost converter, but all boost converters have a minimum input voltage of about 0.9V. But the capacitor still has ...
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34 views

Laptop adapter + DC buck/boost converter or buck convereter only?

I have an old laptop adapter, with 19 V - 4.74 A DC output ratings. Suppose I need to draw 3 A @ 11.1 V for one of my circuits. I have been doing some research about dc-dc converters and have some ...
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1answer
91 views

I can't get the desired output voltage

This is a simulation of a buck boost converter. I want to get -12V as the output voltage , but I get -1.148V. I checked the PWM and the duty cycle and it is right. I think that my problem in ...
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1answer
80 views

Is boost converter enough to provide pulse currents without drawing too much current from a coin cell

I am making a RF circuit which could operate using a 3V coin cell battery like CR2032 or CR2450. In sleep mode it consumes around 10-20uA but during Tx/Rx which lasts for 10ms it consumes ~300mA-ms. ...
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1answer
33 views

Buck-Boost Transformer with Three Phase Wiring

I live in a residence with 120v / 208v electrical service. (Measured as leg1: 124v, leg2: 125v, 215v across legs) I am nearly certain that the service is the result of two legs of three phase power. ...
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26 views

Can I cascade boost converters?

Can I cascade the boost converters, each converter input connected to input solar panel (48 Voc and 9A Isc), and the converter output is 110 V? What should I do to connect them in cascade?
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2answers
57 views

Boost Converter Stuck at Around 80 Volts

I'm building a boost converter that utilizes a 555 timer switching at 60 kHz at a 96% duty cycle which drives an IRF3205 MOSFET to power a hand wound inductor (calculated to have ~330 uH) with a 6A10 ...
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37 views

output voltage of boost converter

I built a boost converter and I can't see on the oscilloscope the 12V in the output and the real frequency that I defined (70kHz.) What should I do? This is my circuit, and below that is what I see ...
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34 views

TI TPS6116 Output Voltage

I am designing an LED backlight driver as a sub-circuit for a DPI interface. The backlight in question requires 12.8V. I am trying to use the TPS61161 and have read through all of the documentation ...
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13 views

What's the best option to power up a ComputeModule and a backlight LED with a battery?

this is my first foray in a complete PCB for the Raspberry Pi Compute Module (and my 4th PCB ever) and the first one with power management components. My background is Computer Science. I did study ...
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1answer
151 views

Calculate peak input current of switch mode power supply

I have the following problem. MY ATTEMPT The switch-mode power supply looks like it's a boost converter. I found that the DC-transfer functions for the boost converter to be: \$\frac{V_C}{V_{...
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40 views

DIY 3 V -16 V, 300 watt boost converter for ultracapacitors

I am trying to build a power supply for a portable Tesla coil project using 6 × 3000 farad supercapacitors in series (16.2 V @ 500 F). I am trying to maximize the usability of the supercapacitor ...
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87 views

DC DC boost converter with TL494

I am designing a boost converter circuit 12V up to 60V using TL494. (picture below is the circuit I have designed). My problem is that the circuit cannot operate stably at the output voltage of ...
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37 views

Reverse-design simple µC boost converter: How to calculate ideal frequency & pulse width

I aim to create ~400V @ <1mA from a 12V/2A supply to supply a Geiger-Mueller tube using a simple µC driven boost converter for a Geiger counter. The converter consists of just an inductor and a ...
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2answers
28 views

Problem with LTC3872 Voltage Converter. Simulated results not matching with information provided in the datasheet

I'm trying to make a boost converter that takes an input of 3.7V and outputs 5V. I found a chip that I think will work well, the LTC3872 by Linear Technology. In the datasheet they give an example ...
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2answers
100 views

AC-DC High voltage converter

I don't have much experience with power electronics but I'm trying to design a power supply with AC 220Vrms (311peak) to DC 1500V converter to charge a capacitor in 50 miliseconds (and keep charging ...
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2answers
23 views

Boost converter for powering SD card

I want to use a switching boost converter that has 3.3V output in order to power an SD card. Also, the input voltage is a CR2477 battery, with voltage ranging from 2 to 3 volts. I have seen that an SD ...
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60 views

Home project about detecting harmful gases

I am designing a PCB for detecting harmful gases (below is the schematic in Eagle). I have used MQ7 and MQ135 sensors, and the ESP32 WROOM32D MCU. For the power supply, I have used HLK-PM03 since I'...
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2answers
153 views

step up converter

I built a circuit of boost converter and my input voltages, 6-9V. I want to get output at the converter 9-12V, my problem is that I get over 40V and I do not know why, in the code do I have to set ...
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1answer
40 views

Safely powering Dell laptop from external Li-ion battery with a 11.1V/19.5V step-up converter

I need to build a power-bank type device for my Dell Latitude 6530 laptop (19.5V, 90W nominal power input). I have 12 Li-ion 3.7V, 3.35Ah (18650-type) cells, 3S4P configuration (11.1V total output). ...
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1answer
37 views

Calculating the number of turns for my inductor

so i've calculated that I need an inductance of 0.150mH for my inductor. However, I'm trying to figure out the number of turns I need for it. # I've got an answer of 24 turns but this doesn't feel ...
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1answer
63 views

Boost Converter - How the diode keeps conducting?

In the OFF state (SW Open) the voltage across the inductor changes its polarity and "pushes" current through the diode. So we have a voltage source in series with the inductor, producing a voltage ...
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2answers
83 views

In a buck boost inverting converter is there any difference exchanging the position of the diode from the positive to the negative rail?

In a buck boost inverting converter is there any difference exchanging the position of the diode from the positive to the negative rail keeping the same current rotational direction ?
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1answer
52 views

How do I work out the Inductor value on my a digitally controlled conventional boost converter

I’m trying to build a digitally controlled conventional boost converter and implementing a basic Maximum Power Point Tracking (MPPT) algorithm to extract the maximum possible power from the panel ...
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0answers
32 views

Multiple switches/FET's on a boost controller

I'm new to DC-DC converters and I am trying to design a 500W ~12V step up to 50V power supply. I've been looking into boost converters and controllers and I think I need to go with a controller to ...
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32 views

MT3608/SX1308/… boost converter shutdown current (module)

I have a few step-up converter modules such as https://www.aliexpress.com/item/33049532652.html supposedly based on the MT3608 IC: https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/...
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1answer
119 views

Slope compensation in current mode control

There is something a little bit confusing to me between papers dealing with the theory of external slope compensation in current mode control of SMPS and application notes dealing with implementation (...
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1answer
36 views

Low voltage MPPT boost converter IC, constant input voltage

Following scenario: I have a bunch of Sunpower C50 unprocessed single solar cells. I'm trying to make a panel out of them for hiking. According to the datasheet each cell has 0.574 Vmpp an 5.65 Impp ...
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1answer
46 views

How to build synchronous boost converter with IR2104 mosfet driver?

Does anyone know how to build a synchronous boost converter with IR2104 mosfet driver? I am a beginner and I have noooo ideaaa how to connect the circuit. The placement of inductor and capacitor ...
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1answer
115 views

Why isn't my 5-to-24VDC boost converter supplying enough current to turn a 24 VDC motor?

UPDATE #2: 2020-03-28 - I ditched the MC34063 solution and just built an 80 KHz oscillator with a 90% duty cycle with a LM339 comparitor, 4427A nfet driver, IR630 fet, and a very larger ferrite core ...
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1answer
64 views

Boosting 18 V drill battery to 60 V to power LED lights, problems with voltage stability

I have a bunch of Dewalt 18 V batteries and 2 LED shop lights that I converted to DC, specifically 60 V, 1.5 amps per strip. I have had mixed luck and I am looking for a better approach. I have no ...
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2answers
74 views

How to implement step-up DC-DC converter with reverse current capability

I am trying to step up voltage from 24V to 36V using a boost converter, specifically the PI3740-00-LGIZ by Vicor, in order to power a motor. However, I want to be able to do regenerative braking with ...
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0answers
29 views

Boost converter - low inductance and discontinuous or high inductance and continuous?

I'm working on a battery powered application and I need to step up from ~3v to ~25V. I'm trying to balance the peak battery loads vs the overall performance. I'm torn on the inductor. I'm at ~2MHz ...
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0answers
40 views

MAX1771 not boosting voltage

I have made the below circuit using the MAX1771, but it does not work as intended. There is no increase in voltage at the output. It just outputs VIN minus diode drop at “CDI_TEST_HV”, as expected if ...
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2answers
74 views

how to measure current of high voltage 150Hz pwm signal?

I have a step-up converter which produces 130V DC and 12mA max current I generate 130V pulses using an optoisolator PWM duty vary between 10 to 50 (255 max) at 150Hz frequency, but my load (...
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2answers
91 views

Boost converter 3.3 to 5V MAX756

I want to step up my power supply from 3.3V to 5V. For this I choose the MAX756 for his price and his availability. But I don't understand the pinouts... Pin 1 : I can leave it on fly ; Pin 2 : To ...
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1answer
56 views

Why doesn't this diode conduct in a boost converter?

It seems like current should pass through the diode even in the "on state" because the current is flowing in the right direction. Is it because the current will be too low because of the closed switch ...
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2answers
99 views

Is a 24V-48V 40A boost converter possible?

I would like to produce a buck/boost converter that can convert 24V to 48V with a 40A max. output current. It would be used to control a DC motor, specifically the MY1016Z3 DC motor. I cannot use a ...
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0answers
20 views

Non-ideal inductor effect on inductor current in a quadratic boost converter

I'm studying a quadratic boost converter and I'm expecting to see in the lab a constant current in the inductors, with a small ripple associated with energy exchanges between the capacitive and ...
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2answers
45 views

Through hole buck-boost ic [closed]

I'm looking to create my own buck-boost converter but want to test it on a breadboard. I have done online searches but only surface mounted ICs show up. The Texas instruments TPS63061 looks ideal for ...
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2answers
117 views

Create a power supply that accepts 3.7v - 5v and outputs 5v

Hello i was wondering if there is a solution for a power supply to accept a range of 3.7v to 5v and output a constant 5v. Im trying to get a low powered circuit to be able to be powered from either 3....
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2answers
89 views

Boost converter: Finding conducting period for diode in DCM (theoretically)?

I am having a problem finding the conducting period for the diode in a boost converter operated in DCM (theoretically). It is part of a multiple-choice assignment with three questions related to the ...
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5answers
142 views

9 V to 360 V via boost converter?

So I'm fairly new to electronics and I wanted to make a boost converter. I was trying to get 360 V from 9 V and ran my circuit through LTSpice and EveryCircuit but it didn't seem to work. It's a ...
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1answer
75 views

What is wrong with this LCD backlight boost converter circuit

I have been working with a dev board with the LCD backlight circuit shown below. The boost converted used is the TPS61041. On page 18 of the datasheet, there is an example of the backlight circuit ...
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2answers
101 views

How can I tell if this boost converter is in continuous or dis-cont. mode?

I'm trying to intuitively understand a boost converter, so I've built a variable duty-cycle oscillator circuit that can go from 1kHz to 50kHz and allows me to adjust the duty cycle from 5-95% without ...
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2answers
42 views

Subtleties of Boost Conver (Step-up Converter)

simulate this circuit – Schematic created using CircuitLab Generally Boost Converter fault happens in my workplace and difficult to find the problem of converter. So I try to understand the ...
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1answer
64 views

Charge pump vs. boost converter for high current LED driver

I am designing a high current LED driver circuit to power a matrix of pulsed IR LEDs. The LEDs will operate at 5A; 4.6V; 0.1ms pulses (~10 pulses at this frequency, wait 300s, repeat.) The device is ...
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2answers
63 views

Charging a big battery with small solar panels very very slowly

I have a 6V, .7amp solar panel that typically puts out 2-5V under normal conditions. I would like to charge a 12V 5 amp hr lead acid battery over a few days to weeks. The device that I want to ...
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1answer
71 views

Can I safely use a MOSFET switch at the input of a MC33063 boost regulator?

I have a predominantly 3.3V system which occasionally needs to power on a 12V component. Most of the time the component will be off, so in order to preserve power I'd like to avoid idle voltage ...
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33 views

Charging a LiPo Battery with 1.5V Battery

I have a lithium-polymer battery with a voltage of 11.4V. If I want to charge it with a 1.5V power source (AA battery) and I boost the voltage to 11.7V will it slowly charge the LiPo.

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